exam Maths Puzzle Numerical Ability

Write the equation in either slope-intercept form or standard form:

The vertical line through the point(-45,61)

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exam Other Question

Carla invested $28,000, part at 14% and part at 9%. If the total interest at the end of the year is $3,370, how muc did she invest at 14%

These problems confuse me each time, can you help? Thank you so much! ok. i have gotten to x=3(-9 +/-(square root of 71) /all over 10) +3
i need to figure out what x can be. thank you