exam Maths Puzzle Numerical Ability

10+a/7=12;14

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exam Other Question

Use the given conditions to write an equation for the line in slope-intercept form.
Passing through (5, -3) and parallel to the line whose equation is y = -7x + 7.
I THINK that this is a linear equation problem. Can you help me solve this? I don't know how to solve for multiple variables in this way:
{{{2x+2z=2}}}

{{{5x+3y=4}}}

{{{3