## Points a and b both on line y=3x+7 work out the missing y coordinate for a and the missing x coordinate for b

Question

Points a and b both on line y=3x+7 work out the missing y coordinate for a and the missing x coordinate for b

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1 year 2021-09-02T09:19:55+00:00 1 Answers 1 views 0

Missing $$y$$ coordinate for $$a$$ is $$3x+7$$

Missing $$x$$ coordinate for $$b$$ is $$\frac{b-7}{3}$$

Step-by-step explanation:

Given: Equation of a line is $$y=3x+7$$

To find: missing $$y$$ coordinate for $$a$$ and the missing $$x$$ coordinate for $$b$$

Solution:

First find missing $$y$$ coordinate for $$a$$

Put $$x=a$$ in $$y=3x+7$$

$$y=3(a)+7=3a+7$$

Now find the missing $$x$$ coordinate for $$b$$

Put $$y=b$$ in $$y=3x+7$$

$$b=3x+7\\3x=b-7\\\\x=\frac{b-7}{3}$$